Sharp Kabushiki Kaisha Corporation

Takashi Ohno

Junichiro Shigemasa

Kazuomi Hatanaka

Kenji Ogou

Sadao Tachikawa

An apparatus for driving a semiconductor laser device wherein the optical output of the laser device is maintained at a predetermined level by a feedback control. The apparatus includes at least two D/A converters. One of the D/A converters is used for conducting a coarse adjustment of the optical output level, and another of the D/A converters is used for conducting a fine adjustment of the optical output level.

Apparatus for driving a semiconductor laser device

A light-emitting element and a light-responsive element are optically connected with each other through a U-shaped optical guide. An output level of the light-responsive element indicates whether the U-shaped guide is above or below the liquid-level.

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Tammadainishi, Japan

Takashi Ohno